Karasu weather in September

In September, Karasu sees average daytime highs of 24°C and overnight lows near 17°C, with 67 mm of rain across 8.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 22°C by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels humid.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Karasu's 4th-clearest and 7th-windiest month. For the whole year in context, see Karasu's year-round climate.

Daytime high
24°
4th warmest
Overnight low
17°
10th coldest
Rainfall
67 mm
8.3 wet days
Daylight
12 h 18 min
5:43 AM – 6:00 PM
Cloud cover
39%
4th clearest
Wind
9 km/h
7th windiest
Solar energy
4.47 kWh/m²
Travel score
7.5
out of 10

Karasu is district and town in Sakarya, Turkey.

Density
75/km²
people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 25°C in the first days to 22°C by the end.

A typical September day in Karasu reaches about 24°C in the afternoon and slips back to 17°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 27°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12519
22519
32519
42519
52519
62518
72518
82418
92418
102418
112418
122418
132418
142418
152417
162417
172317
182317
192317
202317
212317
222317
232316
242316
252316
262216
272216
282216
292216
302216

How September really feels in Karasu

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Karasu weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 10213.44.79.41.4
Feb / 8612.63.910.41.7
Mar11° / 8712.9211.72.6
Apr15° / 589.70.213.14.6
May19° / 13°558.5014.36.6
Jun24° / 17°578014.97.6
Jul26° / 20°396014.77.9
Aug26° / 21°476.1013.67.8
Sep24° / 17°678.3012.37.5
Oct20° / 14°9710.6010.96.2
Nov15° / 8510.30.59.74.4
Dec10° / 11313.92.79.12.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18218
28218
38119
48020
57921
67921
77921
87822
97822
107723
117624
127624
137525
147327
157327
167228
177129
187129
197030
207030
216931
226931
236832
246733
256733
266733
276634
286634
296634
306535

Chance of precipitation in September

Any precipitation

Karasu gets around 67 mm of rain over 8.3 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 27% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
227
327
427
527
626
726
826
925
1025
1125
1224
1325
1425
1525
1625
1726
1826
1927
2028
2128
2229
2330
2430
2531
2631
2731
2831
2930
3030

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
141633398
251833387
361933366
462134345
572234334
672335314
782436303
882436283
992537273
1092537262
1192638252
12102638242
13102639242
14102739231
15112739221
16112739211
17122839211
18122839201
19132939191
20142939181
21153038161
22163138151
23173137141
24183237131
25193337111
26203336100
2721343690
2823343580
2924343470
3025353470

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:28 AM to 5:58 AM, and sunset from 6:26 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:286:26
212.95:296:24
312.95:306:22
412.85:316:21
512.85:326:19
612.75:336:17
712.75:346:15
812.65:356:14
912.65:366:12
1012.55:376:10
1112.55:386:08
1212.55:396:07
1312.45:406:05
1412.45:416:03
1512.35:426:01
1612.35:436:00
1712.25:445:58
1812.25:465:56
1912.15:475:54
2012.15:485:53
2112.05:495:51
2212.05:505:49
2311.95:515:47
2411.95:525:45
2511.85:535:44
2611.85:545:42
2711.85:555:40
2811.75:565:38
2911.75:575:37
3011.65:585:35

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.47 kWh/m².

For context, solar energy here swings from a low near 1.49 kWh/m² to a high of 6.68 kWh/m² in July across the year — September's 4.47 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.0Bright
254.0Bright
264.0Moderate
273.9Moderate
283.9Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Is September a good time to visit Karasu?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.5
Sightseeing
4th-best month of the year
6.1
Beach & pool
4th-best month of the year

September is one of the better times to visit Karasu for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Karasu in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Karasu sees daytime highs around 24°C and nights near 17°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

Sea temperature near Karasu in September

The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 25°C and coldest in February near 7°C.

It's comfortable for a long swim from Jun 11 to Oct 11 — about 4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb7Bracing
Mar8Bracing
Apr11Bracing
May16Cool
Jun21Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct20Cool
Nov15Cool
Dec11Bracing

UV index in Karasu in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Karasu peaks around June 23 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 8Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr6High
May7High
Jun8Very high
Jul8Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec1Low

Air quality in Karasu in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Karasu is worst in March — around 15 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMar 2015 µg/m³Dec 188 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar15Moderate
Apr14Moderate
May12Moderate
Jun10Good
Jul9Good
Aug9Good
Sep9Good
Oct9Good
Nov9Good
Dec8Good
Location & terrain

Where is Karasu?

Karasu sits at 41.1°N, 30.7°E, 6 m above sea level, in Turkey. The nearest listed city is Karasu Mahallesi, 8.0 km away.

Topography around Karasu

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Karasu.

Within 3 km, the terrain around Karasu has only modest variations in elevation — a maximum elevation change of 105 m around an average of 15 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 469 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.

The land around Karasu is covered by water (38%), trees (24%) and artificial surfaces (24%) within 3 km, water (49%) and trees (39%) within 16 km, and trees (52%) and water (33%) within 80 km.

3 km
105 m
16 km
469 m
80 km
1,820 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Karasu Mahallesi 8.0 km · Kocaali 14 km · Ferizli 25 km · Hendek 34 km · Akçakoca 36 km · Adapazarı 44 km · Kandıra 46 km · Akyazı 47 km

Turkey travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$18,599
2025
Happiness
5.3 / 10
World Happiness, 2025
Homicide rate
3.2
per 100k, 2023
Road deaths
6.7
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 488
Religion
Muslim 100%other 0%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Karasu (41.1044°, 30.6966°, elevation 6 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).